Optical code signal components are generated and then transformed into signal bearing art that conveys machine readable data. The components of an optical code are optimized to achieve improved signal robustness, reliability, capacity and/or visual quality. An optimization program can determine spatial density, dot distance, dot size and signal component priority to optimize robustness. An optical code generator transforms tiles of an optical code or image embedded with the optical code into signal-bearing art using stipple, Voronoi, Delaunay or other graphic drawing methods so as to retain prioritized components of the optical code. The optical code is merged into a host image, such as imagery, text and graphics of a package or label, or it may be printed by itself, e.g., on an otherwise blank label or carton. A great number of other features and arrangements are also detailed.
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4. The method of claim 3 wherein said generating a 2-dimensional (2D) optical code signal comprises combining host artwork according to values of error correction encoded signal elements of the variable payload and the reference signal, the combining being performed by altering luminance of the host artwork.
5. The method of claim 3 wherein said generating a 2-dimensional (2D) optical code signal comprises combining host artwork according to values of error correction encoded signal elements of the variable digital payload and the reference signal, the combining being performed by altering chrominance of the host artwork.
8. The non-transitory computer readable code of claim 7 wherein said generating a 2-dimensional (2D) optical code signal comprises combining host artwork according to values of error correction encoded signal elements of the variable digital payload and the reference signal, the combining being performed by altering luminance of the host artwork.
9. The non-transitory computer readable code of claim 7 wherein said generating a 2-dimensional (2D) optical code signal comprises combining host artwork according to values of error correction encoded signal elements of the variable digital payload and the reference signal, the combining being performed by altering chrominance of the host artwork.
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March 14, 2022
May 23, 2023
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